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3.3. Workers
Follow approved isolation procedures.
Stop work and inform supervision if isolations cannot be completed according to this isolation
process.
3.4. Engineering
Review and approve alternative methods of isolation.
4.0
Procedure
Note: Eliminate pressure from a system prior to adjusting or maintaining attached equipment that has the
potential to release pressure (e.g. adjusting fittings, piping, etc.). This does not apply to equipment
that is designed to be adjusted under pressure (e.g. greasing certain components such as valves,
etc.). Always consult manufacturer maintenance instructions or approved engineering instructions
prior to servicing equipment under pressure.
Isolation of process piping, vessels or equipment from energy and harmful substances (vapors, liquids,
or solids) requires that all inlet and outlet lines be isolated as appropriate for the risk. One of the
following methods of isolation shall be used:
o
Blanking/blinding and line disconnection or a combination thereof.
o
Double block and bleed.
o
An alternative method certified by a professional engineer as providing an equivalent level of safety
(e.g. single valve isolation).
o
Certification of alternate isolation methods can be done on a case‐by‐case basis or through
an appropriately approved BU Engineering Standard.
Select the appropriate isolation method and document on the appropriate isolation or hazard
assessment document.
o
Identify all isolation points on the isolation documentation and communicate to affected workers.
o
All personnel working on isolated equipment have the right to verify the isolation points.
o
All permits and isolation certificates must be available at the work site.
o
Evaluate cathodic systems and isolate as required during the permit or hazard assessment process.
Work must not proceed until the absence of energy and/or harmful substances has been confirmed.
o
Workers must stay out of the line of fire when testing for the absence of energy.
Changes in work conditions or approved work scope require a revalidation of the isolation method prior
to continuing with the work.
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